I use Red stuff on my Clio 172 and Yellows on my 21 Quadra (on Clio V6 330mm discs).
The reds are OK when cold, not 100% but OK, and they get good when warm and stay good even when you hammer the tits off them on track. I have never had discernable fade on reds.
The yellows are not great when cold, enough so that you need to be aware that theyre cold in particular when coming off motorways at warp factor eleventeen down the slip roads and so on. When they get warm you feel them coming to you and you're like "actually yeah, these are OK"....this is fine until they get WARM and the pedal tightens and they start to really bite and when they get hot hot the pedal travel reduces and it's like chucking a god damn anchor out the boot.
In summary the reds are a good all-rounder. The yellows are worse than reds when cold but as they heat up they increase in performance and end up better.